全文获取类型
收费全文 | 870篇 |
免费 | 56篇 |
国内免费 | 24篇 |
专业分类
耳鼻咽喉 | 7篇 |
儿科学 | 50篇 |
妇产科学 | 9篇 |
基础医学 | 77篇 |
口腔科学 | 42篇 |
临床医学 | 71篇 |
内科学 | 143篇 |
皮肤病学 | 27篇 |
神经病学 | 24篇 |
特种医学 | 224篇 |
外科学 | 98篇 |
综合类 | 37篇 |
一般理论 | 1篇 |
预防医学 | 52篇 |
眼科学 | 6篇 |
药学 | 32篇 |
肿瘤学 | 50篇 |
出版年
2022年 | 4篇 |
2021年 | 4篇 |
2019年 | 9篇 |
2018年 | 13篇 |
2017年 | 6篇 |
2016年 | 10篇 |
2015年 | 10篇 |
2014年 | 18篇 |
2013年 | 12篇 |
2012年 | 10篇 |
2011年 | 8篇 |
2010年 | 21篇 |
2009年 | 24篇 |
2008年 | 24篇 |
2007年 | 15篇 |
2006年 | 16篇 |
2005年 | 10篇 |
2004年 | 16篇 |
2003年 | 12篇 |
2002年 | 6篇 |
2001年 | 16篇 |
2000年 | 10篇 |
1999年 | 17篇 |
1998年 | 41篇 |
1997年 | 45篇 |
1996年 | 41篇 |
1995年 | 39篇 |
1994年 | 23篇 |
1993年 | 31篇 |
1992年 | 23篇 |
1991年 | 18篇 |
1990年 | 17篇 |
1989年 | 25篇 |
1988年 | 30篇 |
1987年 | 47篇 |
1986年 | 31篇 |
1985年 | 24篇 |
1984年 | 10篇 |
1983年 | 21篇 |
1982年 | 17篇 |
1981年 | 23篇 |
1980年 | 17篇 |
1979年 | 11篇 |
1978年 | 11篇 |
1977年 | 13篇 |
1976年 | 22篇 |
1975年 | 17篇 |
1934年 | 4篇 |
1927年 | 4篇 |
1926年 | 4篇 |
排序方式: 共有950条查询结果,搜索用时 0 毫秒
81.
82.
Biehl K Frese A Marziniak M Husstedt IW Evers S 《Cephalalgia : an international journal of headache》2008,28(5):553-557
To investigate the possible association between migraine and left-handedness, we enrolled 100 patients with a diagnosis of migraine according to the International Headache Society diagnostic criteria and 100 age- and sex-matched control subjects into a case–control study. Handedness was determined by the Edinburgh Handedness Inventory. There was no significant difference in the frequency or grade of left-handedness between the two groups. Additionally, we pooled our data with those from five similar studies, which did not alter the result. Thus, neither our study nor the meta-analysis support Geschwind and Behan's hypothesis of an association between migraine and left-handedness. 相似文献
83.
BACKGROUND: The risk of hemorrhagic complications after extracorporeal shock-wave lithotripsy (ESWL) increases in patients with aspirin intake, but the hematoma-inducing mechanism has not been understood completely at the ultrastructural level. METHODS: The effect off shock-waves on the kidneys of male Wistar-rats (n=24) was investigated in an experimental setting using a special ESWL device. Ultrastructural examination was performed by light-, transmission electron- and scanning electron microscopy. RESULTS: Shock-wave induced tissue damage appeared in all kidneys independently of aspirin intake. Endothelial detachment, lethal cell injury, gaps and mechanical disruption of the glomerular basement membrane were regularly found. After 1 week, repair processes were completed with evidence of permanent fibrosis in some cases. CONCLUSIONS: ESWL can induce modest as well as fatal damage to renal tissue cells. Therefore, after an ESWL-induced hematoma a second ESWL should not be performed within 1 week of the first treatment. 相似文献
84.
Background
This study presents data on the prevalence rate of infectious markers among voluntary and replacement donors in the blood transfusion service in Armed Forces from 2000 to 2004.Methods
39,646 units of blood were collected from donors during the period from 2000 to 2004. All the samples were screened for hepatitis B surface antigen (HBsAg), human immunodeficiency virus (HIV) 1&2, hepatitis C virus (HCV), and by venereal disease research laboratory test (VDRL).Results
24,527 (61.9%) were voluntary donations and 15,119 (38.1%) replacement donations. Prevalence of HBsAg had decreased, amongst voluntary donors from 1.67% to 0.77% but the positivity rate has not showed significant change. Seropositivity of HIV had decreased both in voluntary and replacement donors to 0.22% and 0.86% respectively. The seropositivity for anti-HCV showed steady decrease amongst voluntary donors from 0.46% to 0.20% in 2004, but in replacement donors, there was an increase in reactivity rate from 0.43% to 0.65%.Conclusion
The increased seropositivity for HCV, HIV and HBsAg could be decreased by introduction of nucleic acid amplification testing (NAT) in minipools for HCV and HIV and introduction of anti-HBcAg (IgM) for hepatitis B virus (HBV) infection. But this may not be possible in near future in developing countries due to financial constraints. At present implementation of strict donor criteria and with use of sensitive laboratory screening tests it is possible to reduce the incidence of transfusion transmitted infections (TTI) in Indian scenario.Key Words: Transfusion transmitted infections, Human immunodeficiency virus, Hepatitis C virus, Hepatitis B virus 相似文献85.
86.
Eight patients with the diagnosis of lymphangiomyomatosis were evaluated with computed tomography (CT), chest radiography, and pulmonary function tests to determine the relationship between the extent of disease seen on imaging studies and functional status. Chest radiographic assessment included the subjective determination of disease extent and measurements of lung length and the arc of the right hemidiaphragm. Disease extent on CT scans was scored as a percentage of lung that was abnormal on the basis of visual assessment of the degree of cystic replacement of the lung parenchyma. Significant correlations were observed between CT scores and percentages of predicted forced expiratory volume in 1 second/forced vital capacity (r = -.92, P less than .002) and diffusing capacity of the lungs for carbon monoxide (r = -.80, P less than .017). No significant correlations were observed between subjective chest radiographic scores and pulmonary function tests, although measurements of lung length and percentage of predicted total lung capacity were correlated (r = .76, P less than .045). CT was more accurate than chest radiography in defining the presence and extent of parenchymal cysts and provided for greater morphologic-physiologic correlation. CT, particularly high-resolution CT, may be useful in the diagnosis and longitudinal evaluation of patients with this disease and may be more sensitive than pulmonary function tests in the early stages of lung damage. 相似文献
87.
DR Foster 《Journal of Medical Imaging and Radiation Oncology》1998,42(2):167-168
A case of miliary tuberculosis following intravesical bacillus Calmette-Guerin (BCG) treatment is described. 相似文献
88.
Gene Probe Analysis in an Informative Family with Multiple Endocrine Neoplasia Syndrome Type 2A (MEN 2A). Improvement in Carrier Risk Estimation 总被引:2,自引:0,他引:2
MORRISON PJ; HADDEN DR; HUGHES AE; KENNEDY L; RUSSELL CJF; NEVIN NC 《QJM : monthly journal of the Association of Physicians》1991,80(1):597-603
Gene probe analysis of the MEN 2A locus on chromosome 10 hasbeen undertaken using the markers TB10.163, RBP 3 and TB14.34in a large kindred with familial medullary thyroid carcinomas,with or without phaeochromocytomas or primary hyperparathyroidism.A maximum LOD score of 2.97 gave strong evidence of close linkagewith zero recombination. For 12 members of the family so far not known to be affectedby any form of the disease the estimated risk of carrying thegene has been considerably decreased in all but one, whose riskhas been greatly increased. 相似文献
89.
DR Hadden 《The Ulster medical journal》1992,61(1):124-125
90.